Apparatus for recording, transmission or reproduction of sound; earphones; headphones; microphones; loudspeakers and loudspeaker systems; preamplifiers; power amplifiers; audio amplifiers; computer software and hardware including for use in controlling and improving the operation and sound quality of audio equipment and devices

'amplifi':18,20 'apparatus':1 'audio':19,38 'comput':21 'control':29 'devic':41 'earphon':9 'equip':39 'hardwar':24 'headphon':10 'improv':31 'includ':25 'loudspeak':12,14 'microphon':11 'oper':33 'power':17 'preamplifi':16 'qualiti':36 'record':3 'reproduct':6 'softwar':22 'sound':8,35 'system':15 'transmiss':4 'use':27

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